• | Crankshaft bearings |
• | Connecting rod bearings |
• | Crankshaft journals |
• | Crankpin journals |
• | Crankshaft oil passages |
• | Crankshaft threaded holes |
Caution: Refer to Safety Glasses Caution in the Preface section.
• | Crankshaft bearings |
• | Connecting rod bearings |
• | Crankshaft journals |
• | Crankpin journals |
• | Crankshaft oil passages |
• | Crankshaft threaded holes |
• | Inspect the crankshaft balancer bolt hole (1) for thread damage |
• | Inspect the crankshaft balancer mounting area (2) for damage |
• | Inspect the crankshaft sprocket pin hole (3) for damage |
• | Inspect the crankshaft main journals (4) for damage |
• | Inspect the crankshaft connecting rod journals (5) for damage |
• | Inspect the crankshaft oil passages (6) for obstructions |
• | Inspect the crankshaft main bearing thrust wall surfaces (7) for damage |
• | Inspect the crankshaft reluctor ring teeth (8) for damage |
• | Inspect the crankshaft counterweights (9) for damage |
• | Inspect the crankshaft rear main oil seal surface (10) for damage |
• | Inspect the crankshaft engine flywheel mounting surface (11) for damage |
• | Inspect the crankshaft engine flywheel bolt holes (12) for thread damage |
• | Inspect the crankshaft pilot hole (13) for damage |
Important: All connecting rod and main journal bearings that have been used in a running engine must be replaced. Never re-use the crankshaft or connecting rod bearings.
The following bearing wear conditions should be used to diagnose engine operating conditions or root cause of a condition.
J 7872 Magnetic Base Dial Indicator
10.1. | Using an outside micrometer, measure the journal at the extreme front and rear locations on the journal. Call these points A and B. |
10.2. | Measure the journal in two new locations exactly 90 degrees from the first points. Call these points C and D. |
10.3. | Subtract A from C and B from D. The differences will indicate journal out-of-round. |
10.4. | The out-of-round should not exceed 0.005 mm (0.00020 in) maximum. |
10.5. | If the specifications are exceeded, replace the crankshaft. |
11.1. | Using an outside micrometer, measure the journal at the extreme front (A) and rear (B) of the journal parallel to the crankshaft centerline. |
11.2. | Subtract the smallest from the largest measurement. The result will be the journal taper. |
11.3. | If the main bearing journal taper exceeds 0.008 mm (0.00032 in), replace the crankshaft. |
11.4. | If the crankpin journal taper exceeds 0.008 mm (0.00032 in), replace the crankshaft. |